There are 9 tritypes for each of the 9 enneatypes. The descriptions below are based on 3 sets of triads, Hornevian, Harmonic, and Psychological. Each of the following 9 tritypes below will be affected by whether the dominant wing is 7 or 9, for a total of 18 types of 8s. A 7 wing would raise the energy higher adding impulsiveness and distractedness, while a 9 wing would lower the energy and make it comparatively more quiet and passive.
825 triple dominant/superior (the know-it-all 8)
835 double competent
845 double withdrawn
826 double compliant
836 double chameleon/multiplicity
846 triple reactive (the weakest 8)
827 double positive
837 triple assertive/aggressive (most powerful tritype of all 27 tritypes)
847 double intense, fickle